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PORequires double button click - simple Ajax application
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2013-02-03T07:14:30.160
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<p>I just started learning AJAX and have made a simple script. Below is the script.</p> <pre><code><!doctype html> <html> <head> <title>Welcome to the forum</title> <script> var XMLHttpRequestObject = false; if(window.XMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); XMLHttpRequestObject.overrideMimeType("text/xml"); } else { document.getElementById("text").innerHTML = "Sorry, your browser does not support AJAX!"; } function getData(dataSource) { XMLHttpRequestObject.open("GET", dataSource); XMLHttpRequestObject.onreadystatechange = function() { if(XMLHttpRequestObject.readyState == 4 && XMLHttpRequestObject.status == 200) { responseData = XMLHttpRequestObject.responseXML; responseDataList = responseData.getElementsByTagName("os"); } } XMLHttpRequestObject.send(null); } function displayMenuItems(dataSource,selectID) { getData(dataSource); var i; for(i=0; i<responseDataList.length; i++) { document.getElementById(selectID).options[i] = new Option(responseDataList[i].firstChild.data); } } </script> </head> <body> <form> <select size="1" id="os"> <option>Select and OS</option> </select> <input type="button" value="Display OS list" onclick="displayMenuItems('os.xml','os')" /> </form> <div id="text">The Operating System you use will appear here!</div> </body> </code></pre> <p></p> <p>When I click the button, what I expect is to show the list of OSes in the HTML list , but it occurs only after clicking the button twice. I can't figure out what the problem is! :(</p> <p>Below is the XML script:</p> <pre><code><?xml version="1.0"?> <osList> <os>Ubuntu</os> <os>Fedora</os> <os>Windows</os> </osList> </code></pre>
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<xml><ajax>
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Requires double button click - simple Ajax application
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